Are healthier older adults choosing managed care?
D000367:Age Factors; D000368:Aged; D016009:Chi-Square Distribution; D002908:Chronic Disease; D005260:Female; D006279:Health Maintenance Organizations; D006304:Health Status; D006306:Health Surveys; D006801:Humans; D007348:Insurance, Health; D008297:Male; D006278:Medicare; D008875:Middle Aged; D008913:Minority Groups; D010415:Pensions; D011243:Preferred Provider Organizations; D012494:Sampling Studies